I have never attempted to remove the headstock. The legs, motor, tailstock and any bed extension will disassemble easily. It's been a few years now since I bought my 1624-II, but as I recall I was able to manage the bed with the headstock attached. Of course a helper wouldn't be a bad thing--and they don't have to be super strong.
Here is a tip from the Nova manual for disassembling or reassembling the legs. Lift the lathe bed up and place it on a table or sawhorses (I used a B&D workmate). This leaves the legs dangling and much easier to put on or off. Maybe the seller could measure the distance for you.